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4=2K-6
We move all terms to the left:
4-(2K-6)=0
We get rid of parentheses
-2K+6+4=0
We add all the numbers together, and all the variables
-2K+10=0
We move all terms containing K to the left, all other terms to the right
-2K=-10
K=-10/-2
K=+5
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